package com.woniu.tms.login.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

/**
 * @Author: peng
 */
@Controller
class CaptchaController {

    // 产生随即的字体
    private Font getFont() {
        Random random = new Random();
        Font[] font = new Font[5];
        font[0] = new Font("Ravie", Font.PLAIN, 24);
        font[1] = new Font("Antique Olive Compact", Font.PLAIN, 24);
        font[2] = new Font("Forte", Font.PLAIN, 24);
        font[3] = new Font("Wide Latin", Font.PLAIN, 24);
        font[4] = new Font("Gill Sans Ultra Bold", Font.PLAIN, 24);
        return font[random.nextInt(5)];
    }

    @RequestMapping("captcha")
    public void getCaptcha(HttpServletRequest request, HttpServletResponse response) throws IOException {

        // 设置响应头 Content-type类型
        response.setContentType("image/jpeg");
        // 以下三句是用于设置页面不缓存
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "No-cache");
        response.setDateHeader("Expires", 0);

        OutputStream os = response.getOutputStream();
        int width = 83, height = 30;
        // 建立指定宽、高和BufferedImage对象
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        // 该画笔画在image上
        Graphics g = image.getGraphics();
        Color c = g.getColor(); // 保存当前画笔的颜色，用完画笔后要回复现场
        g.fillRect(0, 0, width, height);
        // 随即产生的字符串,不包括 i,l(小写L), o（小写O）,1（数字1）0(数字0)
        char[] ch = "abcdefghjkmnpqrstuvwxyz23456789".toCharArray();
        // 随即字符串的长度
        int length = ch.length;
        // 保存随即产生的字符串
        StringBuilder sRand = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < 4; i++) {
            // 设置字体
            g.setFont(getFont());
            // 随即生成0-9的数字
            String rand = Character.toString(ch[random.nextInt(length)]);
            sRand.append(rand);
            // 设置随机颜色
            g.setColor(new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)));
            g.drawString(rand, 20 * i + 6, 25);
        }
        // 产生随即干扰点
        for (int i = 0; i < 10; i++) {
            int x1 = random.nextInt(width);
            int y1 = random.nextInt(height);
            g.drawOval(x1, y1, 2, 2);
        }
        // 将画笔的颜色再设置回去
        g.setColor(c);
        g.dispose();

        // 将验证码记录到session

        request.getSession().setAttribute("captcha", sRand.toString());


        // 输出图像到页面
        ImageIO.write(image, "JPEG", os);
    }

}
